Originally Posted by
smashndash
I think some people are afraid of crushing the carbon. But the lockring is integral to tubeless setups, so I think you can be assured that the lockring will not damage your rim. If it bothers you, try to find a rubber ring that TL valves usually use.
Alternatively, you can do what was suggested above and use tape. I used masking tape. Any thin tape should work. You don’t need to wrap the valve symmetrically. Adding tape to just one side is enough.
I've also seen it be said that having the stem screwed in place can mask problems like the tube getting out of alignment, which might put undue stress on the tube near the base of the stem and make a failure more likely. I don't see how this is a concern with deep rims, though - if the tube was poorly positioned with a shallow rim, then the valve stem would be visibly off-kilter, but with a deep rim, the hole in the rim bed and the hole at the interior would keep the stem aligned, anyway.